1. 讀取https簽發證書中的key

1) 在下面的代碼中,是實現讀取證書字符串來讀取key的,CERTIFICATE 就是一個證書的字符串, 而方法cf.generateCertificate() 接受的是一個InputStream 流,當然這個地方也可以讀取一個文件 new FileInputSream("file path")即可!

public String getCertificateKey() {

CertificateFactory cf = null;

PublicKey publicKey = null;

try {

cf = CertificateFactory.getInstance("X.509");

//DataInputStream di = new DataInputStream("");

X509Certificate cert = (X509Certificate)cf.generateCertificate(new ByteArrayInputStream(CERTIFICATE.getBytes()));

publicKey = cert.getPublicKey();

} catch (Exception e) {

e.printStackTrace();

}

byte[] publicKeyString = Base64.encode(publicKey.getEncoded(), Base64.DEFAULT);

String publickey = new String(publicKeyString);

System.out.println("-----------------公鑰--------------------");

System.out.println(publickey);

System.out.println("-----------------公鑰--------------------");

return publickey;

}

2) 這里的 X509Certificate 文件是 import java.security.cert.X509Certificate; 包路徑下的,

publicString getCertificateKey() {

CertificateFactory cf = null;PublicKey publicKey = null;try{

cf = CertificateFactory.getInstance("X.509");//DataInputStream di = new DataInputStream("");X509Certificate cert = (X509Certificate)cf.generateCertificate(newByteArrayInputStream(CERTIFICATE.getBytes()));publicKey = cert.getPublicKey();} catch(Exception e) {

e.printStackTrace();}

byte[] publicKeyString = Base64.encode(publicKey.getEncoded(),Base64.DEFAULT);String publickey = newString(publicKeyString);System.out.println("-----------------公鑰--------------------");System.out.println(publickey);System.out.println("-----------------公鑰--------------------");returnpublickey;}